[ceph-users] Re: Cache modes libvirt

2022-12-02 Thread Dominique Ramaekers
I use the same technic for my normal snapshot backups. But it’s regarding a Autodesk database. In order to have full support of Autodesk in case things go wrong, I need to follow Autodesk recommendations. That is to do a data-backup (db-dump + file store copie) with their tool being the ADMS

[ceph-users] Re: Cache modes libvirt

2022-12-01 Thread Janne Johansson
> In Ceph/Libvirt docs only cachmodes writetrough and writeback are discussed. > My clients's disks are all set to writeback in the libvirt client > xml-definition. > > For a backup operation, I notice a severe lag on one of my VM's. Such a > backup operation that takes 1 to 2 hours (on a same

[ceph-users] Re: Cache modes libvirt

2022-11-30 Thread E Taka
Some information is missing to give a helpful answer. How do you backup? (Files? RBD via Ceph? Block Device with qemu-img? Which Device driver do you use (Virtio? SATA?). In our production we use Virtio RBD and the Hypervisor standard cache mode. The Disks are snapshoted before the backup with